Improvement in electrotyping



E 1/ faQ/22.72.; .NQ/45W?. Paffzfffyz /2/3 m Y N. PETERS.PHOTO-LITHOGRAPHEH, WASHINGTON D c Ciniird @Sisme JOSEPH A. ADA-MS, YOliBROOKLYN, NEW YORK.

Letters Patent No. 102,07 7, (lated April 19, 1870.

* IMPROV'EMENT IN ELECTROTYPING.

The Schedule referred to in these Letters Patent and making part of thesame.

I, J osnru A. AnAMs, of Brooklyiuin the county of Kings and State of NewYork, have invented a new and improved Connection Griper forElectrotypers Use of which the following is a specification Natura andObjects of (lie Infrcnt'iou.

My invention consists -in certain novel means or mechanism for making aperfect electric connection between a battery and the conducting surfaceof an electrotype1"s mold; and

Itsobject is to great-ly facilitate .the operation of electrotyping, aswill be fully set forth hereafter.

Description of thc Drmv'ngs.

Figure 1 is a perspective view of my ilnproved griper, illustrating themanner in which it holds the mold;

Figure 2 is a side View of it;

Figure 3 is a View of the inner side of' the shorter arm of the griper;and

Figure 4 is a sectional view of tig. '1, taken through the line n' fr.

General Description.

rlhe griper is composed of two arms, A B, connected together by a hingejoint formed of the two pieces, D E.

The upper end of the plate D is bent into the forni" of a hook, and isprovidedwith screw-holes for the reception of the screws d (Z which areemployed to connect the griper to and hold it securely upon vthe rodsuspended over the tank in electric connection with the'battery; and thetwo arms of thev griper are operatedvby vthe thumb-screw c, which passesthrough the plate a, and works in the nut h upon` the arm A, so that thetwo arms are pressed together by turning the screw. v

llhe plate a., secured upon the shorter arm of the griper, is furnishedwith two points, li Ii, whiclrfit into holes made for the poi-pose inthe rim of the molding; pan, at or near the center, so that when thearms of the griper are screwed together the points will be pressed intothe holes.

rlhe sliding clamp uponv the lower end of the arm A is provided with aclamp-screw, by which the lower rim of the molding-pan is securelyclamped upon the lower end of the arm. It is arranged to slide upon thearm in order to admit pans of different sizes.

The shorter arm of the griperis provided with a coiuhicting-wire, j;soldered to the end of the piece l) and laid in grooves cut in the armB. It is covered entirely with wax, ekeept at the point G, where it isexposed to come hi contact with the conductingsurtace ofthe mold.

The parts composing the griper. are made ot' brass or copper and `fatpine wood, so strongly impregnated with resin as to resist the action ofthe acid solu-` tion in which it is immersed. -Hard rubber, or woodartificial] y impregnated with or protected with a covering of coal-tar,paraiine, wax, or any suitable var` nish, may be used in place ofthe atpine.

By this construction the electric connection is made with thecoiulucting-surfuce of the mold only, and the pan itself is entirely outof' the current ot' electricity,

so that no copper can be precipitated upon it. This removes th'enecessity of covering the back and edges of the pan with wax. beforeimmersing it in the solution ofsulphate of' copper, as ,in the modegenerally Jlnacticed, where the pan is connected immediately to'theconducting-wire of the battery, and also saves the time'and laborexpended in removing the wax from the surface of the molding-pan'vbeforeit can be used again, as the surioe of the pan must be true and smoothinorder to obtain a perfect impression ofthe type or wood-cnt in the wax.

Claim.

I claim as my invention- Connecting a battery with the lface of a moldto elcctrotype the same, substantially as described and specified.

J. A. ADAMS. \Vitnlesses G. A. DURGIN, EDwARnE. OsnoRN.

